LTC3736
ABSOLUTE
AXI U
RATI GS
Input Supply Voltage (V
IN
) ........................ – 0.3V to 10V
PLLLPF, RUN/SS, SYNC/FCB,
TRACK, SENSE1
+
, SENSE2
+
,
IPRG1, IPRG2 Voltages ................. – 0.3V to (V
IN
+ 0.3V)
V
FB1
, V
FB2
, I
TH1
, I
TH2
Voltages .................. – 0.3V to 2.4V
SW1, SW2 Voltages ............ –2V to V
IN
+ 1V or 10V Max
PGOOD ..................................................... – 0.3V to 10V
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SENSE1
+
IPRG1
PGND
SW1
V
FB1
BG1
ORDER PART
NUMBER
SW1
24 23 22 21 20 19
I
TH1
1
IPRG2 2
PLLLPF 3
SGND 4
V
IN
5
TRACK 6
7
V
FB2
LTC3736EUF
18 SYNC/FCB
17 TG1
25
16 PGND
15 TG2
14 RUN/SS
13 BG2
UF PART MARKING
3736
8
I
TH2
9 10 11 12
PGOOD
SW2
SENSE2
+
PGND
UF PACKAGE
24-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS PGND
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Main Control Loops
Input DC Supply Current
Sleep Mode
Shutdown
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at RUN/SS
Start-Up Current Source
Regulated Feedback Voltage
Output Voltage Line Regulation
(Note 4)
The
q
denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V unless otherwise specified.
CONDITIONS
MIN
TYP
MAX
UNITS
RUN/SS = 0V
V
IN
< UVLO Threshold
V
IN
Falling
V
IN
Rising
RUN/SS = 0V
0°C to 85°C (Note 5)
–40°C to 85°C
2.7V < V
IN
< 9.8V (Note 5)
q
q
q
2
U
U
W
W W
U
W
(Note 1)
TG1, TG2, BG1, BG2 Peak Output Current (<10µs) ..... 1A
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
Junction Temperature (Note 3) ............................ 125°C
Lead Temperature (Soldering, 10 sec)
(LTC3736EGN) ..................................................... 300°C
TOP VIEW
1
2
3
4
5
6
7
8
9
24 SENSE1
+
23 PGND
22 BG1
21 SYNC/FCB
20 TG1
19 PGND
18 TG2
17 RUN/SS
16 BG2
15 PGND
14 SENSE2
+
13 SW2
ORDER PART
NUMBER
LTC3736EGN
IPRG1
V
FB1
I
TH1
IPRG2
PLLLPF
SGND
V
IN
TRACK
V
FB2
10
I
TH2
11
PGOOD 12
GN PACKAGE
24-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 130°C/ W
300
9
3
1.95
2.15
0.45
0.5
0.591
0.588
2.25
2.45
0.65
0.7
0.6
0.6
0.05
425
20
10
2.55
2.75
0.85
1
0.609
0.612
0.2
µA
µA
µA
V
V
V
µA
V
V
mV/V
3736f
LINER [ LINEAR TECHNOLOGY ]
